[Bug 53541] GM45 regression in commit: 0b9f43a drm/i915: allow pipe A for lvds on gen4

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=53541





--- Comment #8 from Pär Andersson <paran at lysator.liu.se>  2013-02-10 22:58:51 ---
Nice trick. Using xrandr I can change from bad to good and back
again. Just had to figure out to add --mode to the xrandr command to
avoid a black screen.

$ uname -r
3.8.0-rc7
$ # bad
$ xrandr --output LVDS1 --crtc 1 --mode 1440x900
$ # good
$ xrandr --output LVDS1 --crtc 0 --mode 1440x900
$ # bad again

Another thing I just discovered is that running some OpenGL
application also seems to fix (or at least hide) the problem as long
as the GL window remains visible on screen. I discovered this by
starting glxgears to see if it would also freeze, but this opposite
result. Various GL screensavers from xscreensaver also seem to work.

All this is still using Ubuntus 2.17.0 -intel. I will try to install a
more recent -intel driver later.

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