[Bug 92571] New: After activating the second GPU (setprovideroutputsource) changing any XRandr setting leads to inavlid dpi and wrong framebuffer size

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92571

            Bug ID: 92571
           Summary: After activating the second GPU
                    (setprovideroutputsource) changing any XRandr setting
                    leads to inavlid dpi and wrong framebuffer size
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: jan.burgmeier at unicon-software.com
        QA Contact: xorg-team at lists.x.org

Created attachment 119034
  --> https://bugs.freedesktop.org/attachment.cgi?id=119034&action=edit
Xrandr output before setting the dpi manually

Hi,

My setup is the following:

PC: HP T620 Plus with two AMD graphics card
Monitors: 3 Dell 4k Monitos running at 1920x1080. Two are attached to the
primary card and one to the secondary card.

After activating the secondary GPU with "xrandr --setprovideroutputsource"
changing any XRandr setting (resolution, rotation, ...) leads in a too small
framebuffer. It seems that the dpi is wrongly set. It is also not possible to
change the framebuffer with "xrandr --fb". The following commands will fix the
problem:

-----------------------------------------------------------------------

user> xrandr --dryrun --verbose --fb 4080x1920
screen 0: 4080x1920 0x0 mm    infdpi

user> xrandr --verbose --fb 4080x1920
screen 0: 4080x1920 0x0 mm    infdpi
X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Value in failed request:  0x0
  Serial number of failed request:  52
  Current serial number in output stream:  54

user> xrandr --verbose --dpi 96
screen 0: 4080x1920 1079x507 mm  96.00dpi

---------------------------------------------------------------------           

The following versions were used:
Xorg-1.17.2
xf86-video-ati latest git version (ce9914a)
mesa-11.0.0
libdrm-2.4.64
libLLVM-3.7

It does not matter if using DRI2 or DRI3.
It does not matter if ColorTiling2D is on or off.

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