Re: enabling kms for i915 disables brightness control and xrandr

Jesse Barnes
2009-03-30T23:01:20Z

On Tue, 31 Mar 2009 00:57:50 +0200
Soeren Sonnenburg <sonne@debian.org> wrote:

> On Mon, 2009-03-30 at 14:34 -0700, Jesse Barnes wrote:
> > On Mon, 30 Mar 2009 15:37:19 +0200
> > Soeren Sonnenburg <sonne@debian.org> wrote:
> >
> > > On Sun, 2009-03-29 at 15:22 +0200, Soeren Sonnenburg wrote:
> > > > On Sun, 2009-03-29 at 14:07 +0100, Sitsofe Wheeler wrote:
> > > > > (CC'ing dri-devel, Eric Anholt and Jesse Barnes)
> > > > >
> > > > > On Sun, Mar 29, 2009 at 12:34:01PM +0200, Soeren Sonnenburg
> > > > > wrote:
> > > > > > Dear all,
> > > > > >
> > > > > > I am not sure if this is just a user error/ too old
> > > > > > userspace problem,
> > > > >
> > > > > [User stated that 2.6.3 intel driver is being used in another
> > > > > email]
> > > >
> > > > Just to not cause any (further?) confusion, I was using 2.6.1
> > > > when I wrote that email and after compiling/upgrading to 2.6.3
> > > > a number of problems vanished (like Xv works, screen resolution
> > > > is correct, things are *a lot* faster with UXA). However,
> > > > brightness still only works via setpci and xrandr only shows
> > > > the 1024x600 modeline.
> > > >
> > > > > > but I recognized that when I enable kernel based
> > > > > > modesetting on a intel 945 based samsung nc 10 netbook, I
> > > > > > loose brightness control from within X and X resolutions
> > > > > > are wrong (instead of 1024x600 it is 1024x1024) and xrandr
> > > > > > does no longer have the all the modelines ranging from
> > > > > > 1024x600 to 640x350... Trying to change resolutions /
> > > > > > setting the brightness via xrandr results in error messages
> > > > > > being printed.
> > > > > >
> > > > > > Furthermore, this same flag disables Xv support..
> > > > > >
> > > > > > However, screen switches between terminal and X are quite
> > > > > > fast now (without any flicker) and suspend and everything
> > > > > > works stably.
> > > > > >
> > > > > > I recognized that I can set the brightness via
> > > > > >
> > > > > > setpci -s 00:02.1 F4.B=XX
> > > > > >
> > > > > > (XX ranging from 00 to FF) just fine...
> > >
> > > One more thing: Connecting an external display I could turn it on
> > > via xrandr --auto successfully. However, it was not possible to
> > > turn the internal display off (xrandr --output LVDS1 --off) and
> > > switching to the console with the external display connected I
> > > managed to freeze the machine. Turning the external display off
> > > worked somehow (the display then showed vertical stripes) but I
> > > could switch to console.
> >
> > Have you filed bugs for these problems? I think the brightness
> > control issue is due to some missing bits on the 2D side (we don't
> > enable backlight property control when KMS is active, but should),
> > the other issues sound like bugs.
>
> I did nothing besides asking here on lkml. Where should I report what?

Your xrandr problems should be reported at bugs.freedesktop.org against
the xf86-video-intel driver (in the xorg component). A separate bug
report should be filed for the missing backlight property.

Thanks,
--
Jesse Barnes, Intel Open Source Technology Center