https://bugs.freedesktop.org/show_bug.cgi?id=37528
Summary: vgaswitcheroo unable to switch to radeon from intel
GPU: cannot find crtc
Product: xorg
Version: 7.6
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
Created an attachment (id=47090)
--> (https://bugs.freedesktop.org/attachment.cgi?id=47090)
dmesg before echo DDIS > switch
When I try to switch to my radeon HD 6630 discrete GPU on my sandybridge Sony
VAIO VPCSB from intel integrated GPU, I get a segmentation fault in X and even
VT output to screen stops. When I ssh in from another computer and switch back
to the intel GPU, my screen comes back and I can restart X and log in again.
Steps I performed to produce this:
1) make sure both intel and radeon kernel modules are loaded
2) echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch
3) log out of X. At this point the screen is unresponsive and I cannot use the
machine or log into X because it has segfaulted
4) ssh in from another computer
5) echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch
7) switch to VT1 of first computer
8) login and type: sudo service gdm restart from first computer
9) log back into X on first computer
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