Forwarding this bug from Ubuntu reporter Daniel Newman: http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/538377 [Problem] Intermittently with HDMI the display turns off and the monitor reports no HDMI output. [Workaround] When this occurs, issue the following commands: xrandr -d :0 --output DVI-0 --mode 1024x768 which makes the display visible again, in the lower resolution, then xrandr -d :0 --output DVI-0 --mode 1920x1200 which restores the original display. Things then function normally until the next random HDMI output failure. [Original Description] 1) lsb_release -rd Description: Ubuntu lucid (development branch) Release: 10.04 2) apt-cache policy xserver-xorg-video-radeon xserver-xorg-video-radeon: Installed: 1:6.12.191+git20100306.e7b41f8c-0ubuntu0sarvatt Candidate: 1:6.12.191+git20100306.e7b41f8c-0ubuntu0sarvatt Version table: *** 1:6.12.191+git20100306.e7b41f8c-0ubuntu0sarvatt 0 500 http://ppa.launchpad.net lucid/main Packages 100 /var/lib/dpkg/status 1:6.12.191-1ubuntu2 0 500 http://archive.ubuntu.com lucid/main Packages 3) The HD3450 DVI-HDMI output is connected by HDMI cable to an ASUS MK241H monitor. It should provide a 1920x1200 display + audio via the monitor. When it does so, xrandr reports: xrandr -q Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192 DIN disconnected (normal left inverted right x axis y axis) VGA-0 disconnected (normal left inverted right x axis y axis) DVI-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm 1920x1200 60.0*+ 1920x1080 60.0 1600x1200 60.0 1680x1050 60.0 1600x1024 60.2 1400x1050 70.0 60.0 60.0 1280x1024 75.0 60.0 1440x900 75.0 59.9 1280x960 60.0 1360x765 59.8 1360x768 60.0 59.8 1280x800 74.9 59.8 1152x864 75.0 75.0 70.0 60.0 1280x768 74.9 59.9 1280x720 60.0 1024x768 75.1 75.0 70.1 60.0 832x624 74.6 800x600 72.2 75.0 60.3 56.2 720x576 50.0 848x480 60.0 720x480 59.9 640x480 75.0 72.8 72.8 72.8 75.0 60.0 59.9 59.9 720x400 70.1 4) The display generally starts fine, but intermittently, after apparently random times and with random programs running, the display turns off and the monitor reports no HDMI output. Logging in from another machine, everything appears to be normal and xrandr reports the same as above. However, there is no HDMI output to the monitor. This can be fixed by xrandr, using first: xrandr -d :0 --output DVI-0 --mode 1024x768 which makes the display visible again, in the lower resolution, then xrandr -d :0 --output DVI-0 --mode 1920x1200 which restores the original display. Things then function normally until the next random HDMI output failure. Previously, under karmic, I used the closed source "fglrx" driver on the system. It functioned correctly, without any drop-outs. Having mplayer running continuously but paused seems to prevent the HDMI output turning off. Maybe this is some power management issue, where having mplayer running prevents the HDMI output getting into some low power state from which it cannot return.
Created attachment 34355 [details] xorg.conf
Created attachment 34356 [details] dmesg.txt
Created attachment 34357 [details] Xorg.0.log
you might try loading the radeon drm with new_pll=0 or try this patch: http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commit;h=383be5d1789d9a7a2e77dca1cb0aca89507d069e if your drm doesn't already have it.
Using the ubuntu 2.6.33-020633-generic kernel, setting new_pll=0 makes the system unusable. From the time it goes into graphics mode just prior to gdm starting, the screen blinks to black every few seconds, then returns to normal for a second or two, then repeats this sequence. How can I check if this patch has been applied to a ubuntu kernel image? On 24/03/10 02:18, bugzilla-daemon@freedesktop.org wrote: > http://bugs.freedesktop.org/show_bug.cgi?id=27259 > > > > > > --- Comment #4 from Alex Deucher<agd5f@yahoo.com> 2010-03-23 08:18:42 PST --- > you might try loading the radeon drm with new_pll=0 or try this patch: > http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commit;h=383be5d1789d9a7a2e77dca1cb0aca89507d069e > if your drm doesn't already have it. > > >
(In reply to comment #5) > Using the ubuntu 2.6.33-020633-generic kernel, setting new_pll=0 makes > the system unusable. > > From the time it goes into graphics mode just prior to gdm starting, > the screen blinks to black every few seconds, then returns to normal for > a second or two, then repeats this sequence. > > How can I check if this patch has been applied to a ubuntu kernel image? > Bryce would know for sure, but it was only applied after 2.6.33 was released, so I suspect it's not in the ubuntu kernel. The 2.6.34rcX kernels should have it.
I've filed a request for the kernel team to include it, on a separate bug report.
(Actually, it was the downstream bug report for this bug report *grin*)
Is this still an issue with a newer driver/kernel?
Sorry, I've moved on to newer hardware and can't check the current kernel On 25/04/12 22:58, bugzilla-daemon@freedesktop.org wrote: > https://bugs.freedesktop.org/show_bug.cgi?id=27259 > > --- Comment #9 from Alex Deucher<agd5f@yahoo.com> 2012-04-25 05:58:45 PDT --- > Is this still an issue with a newer driver/kernel? >
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