On Tuesday 13 February 2018 15:27:26 Ville Syrjälä wrote: > On Tue, Feb 13, 2018 at 09:50:30AM +0100, Pali Rohár wrote: > > On Tuesday 06 February 2018 16:21:43 Pali Rohár wrote: > > > Hi! I'm periodically getting following message in dmesg on Lenovo > > > Thinkpad X1 Carbon 3rd generation: > > > > > > [drm] Reducing the compressed framebuffer size. This may lead to less power savings than a non-reduced-size. Try to increase stolen memory size if available in BIOS. > > > > > > In BIOS I already set GPU size to 512M, but this did not help. Also > > > update to last BIOS version did not help. > > > > > > So why this message is periodically print in dmesg? And what can I do > > > with this problem? > > > > > > And why cannot Linux kernel allocate itself more memory for GPU (if BIOS > > > can/could do that)? Is not 512MB for GPU enough? > > > > And here is output from lspci, which clearly says that 512MB is already > > set for GPU: > > The PCI BAR size has nothing to do with the size of the stolen memory. > The BAR just provides a window into the global GTT address space of the > GPU. Stolen memory is a contiguous chunk of physical memory carved out > by the BIOS. Ok, how could I detect how much memory was stolen? In dmesg I see following lines: [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x0000000000057fff] usable [ 0.000000] BIOS-e820: [mem 0x0000000000058000-0x0000000000058fff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000059000-0x000000000008bfff] usable [ 0.000000] BIOS-e820: [mem 0x000000000008c000-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000ab908fff] usable [ 0.000000] BIOS-e820: [mem 0x00000000ab909000-0x00000000abb08fff] type 20 [ 0.000000] BIOS-e820: [mem 0x00000000abb09000-0x00000000acbfefff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000acbff000-0x00000000acd7efff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x00000000acd7f000-0x00000000acdfefff] ACPI data [ 0.000000] BIOS-e820: [mem 0x00000000acdff000-0x00000000acdfffff] usable [ 0.000000] BIOS-e820: [mem 0x00000000f80f8000-0x00000000f80f8fff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000024dffffff] usable [ 0.000000] Reserving Intel graphics memory at 0x00000000ae000000-0x00000000afffffff [ 0.000000] Memory: 7972840K/8282704K available (6196K kernel code, 1159K rwdata, 2848K rodata, 1408K init, 688K bss, 309864K reserved, 0K cma-reserved) > The BIOS may or may not provide a knob to change the size > of the stolen memory. In BIOS Setup screen I have option to choose GPU memory and I set it to max 512MB. So this is not the right option... And why cannot kernel use some continuous check of RAM itself? > > > > $ lspci -v -s 00:02.0 > > 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller]) > > Subsystem: Lenovo HD Graphics 5500 > > Flags: bus master, fast devsel, latency 0, IRQ 46 > > Memory at e0000000 (64-bit, non-prefetchable) [size=16M] > > Memory at c0000000 (64-bit, prefetchable) [size=512M] > > I/O ports at 3000 [size=64] > > [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] > > Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- > > Capabilities: [d0] Power Management version 2 > > Capabilities: [a4] PCI Advanced Features > > Kernel driver in use: i915 > > Kernel modules: i915 > > > > -- > > Pali Rohár > > pali.rohar@xxxxxxxxx > > _______________________________________________ > > dri-devel mailing list > > dri-devel@xxxxxxxxxxxxxxxxxxxxx > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > -- Pali Rohár pali.rohar@xxxxxxxxx _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
