On 2019/4/29 下午6:41, Michel Dänzer wrote: > On 2019-04-28 2:02 a.m., Qu Wenruo wrote: >> Hi, >> >> When tweaking eGPU under Linux, I hit one strange behavior. >> >> The integrated GPU is Intel HD630, using the DDX driver. >> The eGPU is an RX580, using amdgpu driver. Using thunderbolt 3 >> connection. (4x lanes) >> >> All 2 monitors are connected to the eGPU, using DP and HDMI. >> >> At first glance, it works with some quirks (hot plug doesn't work, hot >> unplug crash the kernel), but at least it works without any config. >> Also tested DRI_PRIME=1 with offload for games, it works well playing >> games in the laptop display. >> >> But when I try to close the lid, the external monitors get very laggy. >> (WM is muffer from cinnamon) >> >> My guess is, without any config, the external monitor is still rendered >> by the Intel GPU, as all monitor shares the same screen space. >> And when the lid is closed, eGPU is forced to its lowest performance. > > It's because the Present extension (used for presentation with DRI3) > only supports the primary GPU (as far as Xorg is concerned), in your > case the Intel one. When all outputs of the primary GPU are disabled, > Present cannot use any of them for timing purposes, so it falls back to > a 1 Hz timer for presentation.
Is it possible to disable Intel one completely at X start time? Just regular xorg.conf.d with amdgpu only device section? Thanks, Qu > > Potential workarounds: > > Disable DRI3. > > Force-enable the laptop's internal output while the lid is closed, e.g. > using xrandr. > >
signature.asc
Description: OpenPGP digital signature
_______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: https://lists.x.org/mailman/listinfo/xorg Your subscription address: %(user_address)s
