Bug#703291: [xserver-xorg-video-nouveau] Dual display problem: Using xrandr to setup dual displays causes X to hang
Kernel folks, this appears to be a regression resulting from the DRM 3.4
backport.
On 2013-03-18 02:05 +0100, Guy Heatley wrote:
> Package: xserver-xorg-video-nouveau
> Version: 1:1.0.1-5
> Severity: important
>
> --- Please enter the report below this line. ---
>
> Since upgrading my (Wheezy) desktop machine a couple of days ago with
> APT, my dual-display setup has stopped working.
I assume that the last upgrade was less than half a year ago? If so,
it's almost certainly a problem with the latest kernel.
> I run an xrandr script as I login to set up my twin displays:
>
> # 1280x1024 59.89 Hz (CVT 1.31M4) hsync: 63.67 kHz; pclk: 109.00 MHz
> xrandr --newmode "1280x1024_60.00" 109.00 1280 1368 1496 1712 1024
> 1027 1034 1063 -hsync +vsync
> xrandr --addmode DVI-I-1 1280x1024_60.00
> xrandr --output VGA-1 --primary --gamma 1.2:1.2:1.05 --brightness 0.95
> --dpi 96
> xrandr --output DVI-I-1 --mode 1280x1024_60.00 --right-of VGA-1
> --gamma 0.75:0.9:0.9 --brightness 0.9 --dpi 96
>
> Running this script in Gnome or XFCE now causes X to immediately hang,
> and requires I log in to the machine via SSH and reboot it.
>
> In fluxbox or KDE the script simply doesn't work (but no hang ... well
> fluxbox hangs X when I log out)
>
> Concerning my secondary display (the one called "DVI-I-1" in the
> script): the graphics card has never been able to poll any monitor
> attached for any EDID information (I suspect the DVI-A to SVGA adapter
> I use is not fully wired?). Anyway, I boot with the
> "drm_kms_helper.poll=0" in my grub.cfg to prevent constant futile polling.
> I don't know if this has any bearing?
Remove that parameter to find out.
> Thanks for any advice.
Can you confirm that downgrading linux-image-3.2.0-4-amd64 to 3.2.35-2
(available on snapshots.debian.org[1]) fixes the problem?
Cheers,
Sven
1. http://snapshot.debian.org/package/linux/3.2.35-2/#linux-image-3.2.0-4-amd64_3.2.35-2
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