2013/12/29 Tom Li <[email protected]>: > Anyone who has a YeeLoong Laptop will find the graphics performance is > unacceptable. Even just run dmesg, the output will take a lot of time. > > In fact, there is a built-in 2D acceleration in SM712, the video chip of > YeeLoong. And the driver which supports the acceleration, appeared in the > early-days pull request of YeeLoong to the Linux Kernel. > > But, later on, a crucial bug had been found. > >> it may make the whole system hang when scrolling the screen, for example, >> if we >> copy some files from another machines to yeeloong via scp and the screen >> output is enabled, the whole system may hang. > > So, developers had to remove the acceleration-related code. Then, we got > poor performance on the text-mode framebuffer - until today. If we can fix > up the buggy driver, the output will become 10x faster at least. > > I just a user of YeeLoong, who don't have enough knowledge to work with that > driver. And I noticed the issue. I'm sending the email to provided the > information for anybody interest in hacking and debugging the driver for the > community. > > Any discussion are welcomed. > > Cheers, > Tom Li
The removed code can be found at here: http://dev.lemote.com/cgit/linux-loongson-community.git/commit/?h=linux-3.8-stable&id=4d33b8d7a26a97b3e875dc02543bbe04e58d4e48 And here is the datasheet of SM712: https://romanrm.net/dl/loongson/info/LynxEM%2BDatabook%20Rev%201.2.pdf -- You received this message because you are subscribed to the Google Groups "loongson-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/loongson-dev. For more options, visit https://groups.google.com/groups/opt_out.
