I upgraded kernel to 3.10.7-gentoo-r1 and switched from old matroxfb framebuffer graphics drivers to KMS mgag200 drivers following WIKI: https://wiki.gentoo.org/wiki/Xorg/Configuration After rebooting, got nice graphical boot up, so KMS working, yeah! But xorg-server refused to start because it said the kernel was already claiming the grahics device. So I blacklisted mgag200 and rebuilt initramfs with genkernel, rebooted without KMS support, and xorg-server now starts with mga driver. After starting xorg-server, I can now modprobe mgag200 without issue. But if I load mgag200 BEFORE starting X, mga won't load. Reproducible: Always Steps to Reproduce: 1. load mgag200 KMA kernel graphics driver 2. startx using mga driver 3. Actual Results: X won't start because graphics device claimed by another driver Expected Results: X should start even if KMS framebuffer in use; otherwise what would be the point of having fancy boot graphics but no GUI once booted? # lspci -k VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 (rev 0a) Subsystem: Super Micro Computer Inc Device a711 Kernel driver in use: mgag200 Kernel modules: mgag200 # zgrep CONFIG_DRM /proc/config.gz |grep -v "^#" CONFIG_DRM=y CONFIG_DRM_KMS_HELPER=m CONFIG_DRM_TTM=m CONFIG_DRM_MGA=m CONFIG_DRM_MGAG200=m # lsmod|grep mga mgag200 27501 1 syscopyarea 2946 1 mgag200 sysfillrect 2974 1 mgag200 sysimgblt 2162 1 mgag200 drm_kms_helper 29509 1 mgag200 ttm 63316 1 mgag200 BTW, once I load the KMS mgag200 driver, I can't seem to unload it or the modules using it (kernel says they're all in use) x11-base/xorg-server-1.14.3-r2 x11-drivers/xf86-video-mga-1.6.2
I believe this is on purpose. Use either matroxfb + xf86-video-mga, or mgag200 + xf86-video-modesetting.
(In reply to Jeremy Johnson from comment #0) > BTW, once I load the KMS mgag200 driver, I can't seem to unload it or the > modules using it (kernel says they're all in use) That is normal and expected too, you need to detach the KMS driver from the framebuffer console before you can unload it.
Thank you. I installed xf86-video-moesetting, then removed mgag200 from /etc/modprobe.d/blacklist.conf and ran genkernel to get a new initramfs and rebooted All is now working!
