Alex Bowden
2018-09-24 17:30:35 UTC
Hi all,
I'm getting terrible screen distortion/tearing with a SiliconMotion SM712 LynxEM+ with 4MB of video ram.
If you google around it seems the issue has been seen by others too, but I *think* only with EXA enabled. I have not seen the problem when acceleration is disabled. I dug into the
EXA code in the xf86-video-siliconmotion driver and found that if I modify the EXA "offScreenBase" in SMI_EXAInit() the tearing is drastically reduced. In my testing I just set it to memorySize/2. I do not know what the proper method is. I did try to disable the offscreen memory manager but that caused Xorg to panic somewhere after "Initializing DRI2".
I am looking for any suggestions. I'd like to eventually get a fix checked in if possible.
Thanks,
Alex
I'm getting terrible screen distortion/tearing with a SiliconMotion SM712 LynxEM+ with 4MB of video ram.
If you google around it seems the issue has been seen by others too, but I *think* only with EXA enabled. I have not seen the problem when acceleration is disabled. I dug into the
EXA code in the xf86-video-siliconmotion driver and found that if I modify the EXA "offScreenBase" in SMI_EXAInit() the tearing is drastically reduced. In my testing I just set it to memorySize/2. I do not know what the proper method is. I did try to disable the offscreen memory manager but that caused Xorg to panic somewhere after "Initializing DRI2".
I am looking for any suggestions. I'd like to eventually get a fix checked in if possible.
Thanks,
Alex