Didn't get any response yet, hence copying LKML for a broader audience. On 11/04/2011 03:36 PM, Daniel Mack wrote:
I'm facing a bug on a Samsung X20 notebook which features an i915 chipset (output of 'lspci -v' attached). The effect is that setting the backlight to odd values causes the value to be misinterpreted. Harald Hoyer (cc:) had the same thing on a Netbook (I don't recall which model it was). So this will turn the backlight to full brightness: # cat /sys/class/backlight/intel_backlight/max_brightness 29750 # echo 29750 > /sys/class/backlight/intel_backlight/brightness However, writing 29749 will turn the display backlight off, and 29748 appears to be the next valid lower value. It seems like the IS_PINEVIEW() branch in drivers/gpu/drm/i915/intel_panel.c:intel_panel_actually_set_backlight() could do the right thing, but this code is written for an entirely different model, right? I can reproduce this on 3.0 and 3.1 vanilla as well as with the current mainline git. Let me know if there is any patch that I can test. Thanks, Daniel
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 03) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, fast devsel, latency 0 Capabilities: [e0] Vendor Specific Information: Len=09 <?> Kernel driver in use: agpgart-intel 00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03) (prog-if 00 [VGA controller]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, fast devsel, latency 0, IRQ 16 Memory at b0080000 (32-bit, non-prefetchable) [size=512K] I/O ports at 1800 [size=8] Memory at c0000000 (32-bit, prefetchable) [size=256M] Memory at b0000000 (32-bit, non-prefetchable) [size=256K] Expansion ROM at <unassigned> [disabled] Capabilities: [d0] Power Management version 2 Kernel driver in use: i915 Kernel modules: intelfb, i915 00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: fast devsel Memory at 42000000 (32-bit, non-prefetchable) [disabled] [size=512K] Capabilities: [d0] Power Management version 2 00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 03) (prog-if 00 [Normal decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 00003000-00003fff Memory behind bridge: b4000000-b7ffffff Prefetchable memory behind bridge: 00000000d0000000-00000000d3ffffff Capabilities: [40] Express Root Port (Slot+), MSI 00 Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [90] Subsystem: Samsung Electronics Co Ltd Device c01a Capabilities: [a0] Power Management version 2 Capabilities: [100] Virtual Channel Capabilities: [180] Root Complex Link Kernel driver in use: pcieport Kernel modules: shpchp 00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0, IRQ 23 I/O ports at 1820 [size=32] Kernel driver in use: uhci_hcd 00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0, IRQ 19 I/O ports at 1840 [size=32] Kernel driver in use: uhci_hcd 00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0, IRQ 18 I/O ports at 1860 [size=32] Kernel driver in use: uhci_hcd 00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0, IRQ 16 I/O ports at 1880 [size=32] Kernel driver in use: uhci_hcd 00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03) (prog-if 20 [EHCI]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0, IRQ 23 Memory at b0040000 (32-bit, non-prefetchable) [size=1K] Capabilities: [50] Power Management version 2 Capabilities: [58] Debug port: BAR=1 offset=00a0 Kernel driver in use: ehci_hcd 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d3) (prog-if 01 [Subtractive decode]) Flags: bus master, fast devsel, latency 0 Bus: primary=00, secondary=02, subordinate=06, sec-latency=32 I/O behind bridge: 00004000-00004fff Memory behind bridge: b8000000-b80fffff Prefetchable memory behind bridge: 0000000044000000-0000000049ffffff Capabilities: [50] Subsystem: Gammagraphx, Inc. (or missing ID) Device 0000 00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 03) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0, IRQ 17 I/O ports at 1c00 [size=256] I/O ports at 18c0 [size=64] Memory at b0040800 (32-bit, non-prefetchable) [size=512] Memory at b0040400 (32-bit, non-prefetchable) [size=256] Capabilities: [50] Power Management version 2 Kernel driver in use: snd_intel8x0 Kernel modules: snd-intel8x0 00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Modem Controller (rev 03) (prog-if 00 [Generic]) Subsystem: Samsung Electronics Co Ltd Device 2115 Flags: medium devsel, IRQ 20 I/O ports at 2400 [size=256] I/O ports at 2000 [size=128] Capabilities: [50] Power Management version 2 Kernel modules: snd-intel8x0m 00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 03) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0 Kernel modules: iTCO_wdt, intel-rng 00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 03) (prog-if 8a [Master SecP PriP]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 0, IRQ 18 I/O ports at 01f0 [size=8] I/O ports at 03f4 [size=1] I/O ports at 0170 [size=8] I/O ports at 0374 [size=1] I/O ports at 1810 [size=16] Kernel driver in use: ata_piix 00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: medium devsel, IRQ 5 I/O ports at 18a0 [size=32] Kernel modules: i2c-i801 02:05.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, fast devsel, latency 32, IRQ 22 Memory at b8000000 (32-bit, non-prefetchable) [size=8K] [virtual] Expansion ROM at 44000000 [disabled] [size=64K] Capabilities: [40] Power Management version 2 Kernel driver in use: b44 Kernel modules: b44 02:07.0 Network controller: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection (rev 05) Subsystem: Intel Corporation Samsung P35 integrated WLAN Flags: bus master, medium devsel, latency 32, IRQ 20 Memory at b8002000 (32-bit, non-prefetchable) [size=4K] Capabilities: [dc] Power Management version 2 Kernel driver in use: ipw2200 Kernel modules: ipw2200 02:09.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev b3) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 168, IRQ 16 Memory at 000da000 (32-bit, non-prefetchable) [size=4K] Bus: primary=02, secondary=03, subordinate=06, sec-latency=176 Memory window 0: 50000000-53fff000 (prefetchable) Memory window 1: 4c000000-4ffff000 I/O window 0: 00004400-000044ff I/O window 1: 00004000-000040ff 16-bit legacy interface ports at 0001 Kernel driver in use: yenta_cardbus Kernel modules: yenta_socket 02:09.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C552 IEEE 1394 Controller (rev 08) (prog-if 10 [OHCI]) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 64, IRQ 17 Memory at b8003000 (32-bit, non-prefetchable) [size=2K] Capabilities: [dc] Power Management version 2 Kernel driver in use: firewire_ohci Kernel modules: firewire-ohci 02:09.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 17) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: bus master, medium devsel, latency 32, IRQ 18 Memory at b8003800 (32-bit, non-prefetchable) [size=256] Capabilities: [80] Power Management version 2 Kernel driver in use: sdhci-pci Kernel modules: sdhci-pci 02:09.3 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 08) Subsystem: Samsung Electronics Co Ltd Device c01a Flags: medium devsel, IRQ 255 Memory at b8003c00 (32-bit, non-prefetchable) [size=256] Capabilities: [80] Power Management version 2
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