https://bugs.freedesktop.org/show_bug.cgi?id=94811

Bug ID: 94811 Summary: ATI radeon driver displays nothing or a client refused to switch message on hybrid graphics Product: DRI Version: unspecified Hardware: Other OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: DRM/Radeon Assignee: dri-devel@lists.freedesktop.org Reporter: saurav1.net@gmail.com

Created attachment 122692 --> https://bugs.freedesktop.org/attachment.cgi?id=122692&action=edit dmesg output for the radeon driver

On a Lenovo G50-80 with Intel HD Graphics 5500 (Broadwell GT2) and Advanced Micro Devices [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330] using vgaswitcheroo with echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch results in a blank screen on logging out or in a message that client 0 refused to switch and a reversion to the login screen (depending on the display manager in use) on logging out and trying to log back in. The computer can be powered off normally using the power button or the options in the login screen if visible or by switching to a different VT. Trying to use the radeon driver with an XOrg configuration file like the one attached results in the display manager not starting (other VTs remain operational). The XOrg log (attached) shows that the radeon driver fails to find a screen to its liking,

(EE) RADEON(0): No modes. (EE) Screen(s) found, but none have a usable configuration.

and then gives up altogether:-

(EE) no screens found(EE)

The message "radeon 0000:04:00.0: VCE init error (-22)." appears during boot; the dmesg output for radeon is attached.

The problem occurs irrespective of whether the module parameter radeon.runpm = 0 or not.

The radeon configuration attached is adapted from the one used by Ubuntu 15.10 for fglrx. fglrx works properly on Ubuntu 15.10.