On Wed, Nov 6, 2013 at 12:14 PM, Robin H. Johnson <robbat2@xxxxxxxxxx> wrote: > (Resending to dri-devel because the first one didn't make it). > > I apologize for not sending this sooner, but I wanted to be really sure that I > wasn't introducing the bug elsewhere, and I was lacking time to even narrow it > down this far. > > TL;DR: > 3.11 kernel does proper modeset for dual 1920x1200 outputs > 3.12-rc5/rc7 kernel fails to do proper modeset, blank screen after radeon loaded > Can you bisect? Alex > Symptoms: > - With implicit video= modes, after the radeon module loads, both monitors just go blank. > Kernel message: radeon 0000:01:00.0: No connectors reported connected with modes > X does not visible start, screen stays black. > - With explicit video= modes, after the radeon module loads, both monitors during the > kernel boot display very garbled output; after X starts, they are in > 1024x768, with no higher modes listed. > > Attached are four dmesg [1] runs, on v3.11 vs v3.12-rc7, with both explicit > video parameters, and implicit video parameters; as well as drm.debug=0x06 in > ALL cases; as well as two xorg logs (both from the implicit variants). > > testcase 1 (implicit): modeset=1 fbcon=map:0 drm.debug=0x06 > testcase 2 (explicit): video=HDMI-A-1:1920x1200e video=DVI-I-1:1920x1200e modeset=1 fbcon=map:0 drm.debug=0x06 > > I have produced this bug with three different cards: > CEDAR 0x1002:0x68F9 0x1043:0x03CA (used for all these bug reports) > CEDAR 0x1002:0x68F9 0x174B:0xE164 > TAHITI 0x1002:0x6798 0x1458:0x2261 (7970, borrowed before) > > This happened as far back as 3.12-rc5 for me, but I didn't debug more at the > time. > > Monitors: > (Left) Dell U2410 via DVI > (Center) Dell U2413 via HDMI > (Right is another U2410, not connected at all) > > Userspace: > xorg-server-1.14.3 > mesa-9.2.1 > xf86-video-ati-7.2.0 > > I think the error might be and off by one in the connector probing, based on > this: > > 3.11: > [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:15:HDMI-A-1] > [drm:radeon_atombios_connected_scratch_regs], DFP1 connected > [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:15:HDMI-A-1] probed modes : > > 3.12-rc7: > [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:16:HDMI-A-1] > [drm:radeon_process_i2c_ch], hw_i2c error > [drm:radeon_atombios_connected_scratch_regs], DFP1 disconnected > [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:16:HDMI-A-1] disconnected > > [1] yes I know about the bonding error, that's a separate issue I need > to mail to LKML/netdev. > > -- > Robin Hugh Johnson > Gentoo Linux: Developer, Trustee & Infrastructure Lead > E-Mail : robbat2@xxxxxxxxxx > GnuPG FP : 11ACBA4F 4778E3F6 E4EDF38E B27B944E 34884E85 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/dri-devel > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
