Am Freitag, den 15.06.2018, 16:31 -0700 schrieb Ryan C: > > Hello, > > We are having trouble getting Linux to function properly on SuperMicro > hardware (X10SRI-F + E5-2620v4) which uses the AST2400 for VGA output. We have > tried several "desktop" distributions: Ubuntu, Fedora, Xubuntu, Lubuntu, and > Debian. As well as several versions of Ubuntu. We noticed the issue first > starts with Ubuntu 16.04.2 and is still present in 18.04. In 16.04.1 and below > the video is working fine. Debian is also using a newer kernel which has > problems with this aspeed chip. > > Our issue is that the video output is very very slow at updating. Even the TTY > framebuffer console can be slow at rendering. We open a window or click a menu > and we can see each line of the display being drawn very slowly. Similarly, > the login screens respond very slowly to keyboard input and mouse lags and > jumps around. > > We have narrowed the issue down to specifically to Linux Kernel version 4.9 > and above. Running Kernel version 4.8 or lower has no video issues at all. > > Is this a known issue? Is there a known fix? Maybe we need to roll back the > BIOS? > > There are two possible fixes we found, but they may just be covering up the > issue rather than fixing it: > > 1) set the cpu frequency in Linux to the maximum speed, with "performance" > governor. This helps, but doesn't completely solve the slow video rendering > and tearing. Also, it is not permanent. > > 2) Set the gpu/vga OPROM to "EFI" in the BIOS. This seems to fix the slow > graphics issue on the desktop, but does not help with the slow rendering on > the login screen. > > From what we can tell, the "ast" video driver is being used. Moving the ast > kernel module from one system do another doesn't do anything, but switching > between 4.8 and 4.9 is where everything breaks. > Do you have the same issue in the KVM/HTML5 viewer over IPMI? I use a X11SSM-F witch has also the AST2400. Currently I use the stretch- backports kernel because the EDAC module of kaby lake cpu's is not supported in 4.9 With 4.15 I had some strange wrong color output during boot, the tty color switched to red. This issue was gone gone after the installation of intel-microcode from stretch- backports. Have a nice day, -- Jens Sauer <jsauer65@gmail.com> GPG Key: 5C0B0084 Fingerprint: 75F3 6232 1F69 82E8 F5E0 D151 850E 2908 5C0B 0084
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