https://bugzilla.kernel.org/show_bug.cgi?id=15850
Summary: Switcheroo: LVDS on radeon not working after suspend
Product: Drivers
Version: 2.5
Kernel Version: 2.6.34-rc4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=26139)
--> (https://bugzilla.kernel.org/attachment.cgi?id=26139)
Dmesg after resume with not working LVDS
System:
Lenovo Ideapad U330 with Radeon 3450 and Intel 4500MHD
Arch Linux current with kernel 2.6.34-rc4 (+switchable graphics).
Problem:
LVDS doesn't come back after suspend while HDMI does with or without X server.
Ways to reproduce:
1. Start into console (init 3)
2. Load modules in this order: i915, radeon, fbcom
3. cat DDIS > $STATE
4. pm-suspend
5. Press any key to resume the system
8. *bam*. LVDS is off (backlight is off, no garbage, no cursor) and HDMI works.
Notes:
1. Before using switchable graphics (in Discrete only BIOS setting) suspend
resumed cleanly in X and in console.
2. I guess this might have something to do with the order I'm loading the
modules
2. My guess is: radeon tries to bring up only LVDS-0 and not LVDS-1. After
switcheroo, my LVDS is named LVDS-1 in radeon and LVDS-0 in intel, regardless
of which one is used. HDMI is only available in radeon as HDMI-0 and it gets
resumed.
Will attach dmesg.
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