Glxgears Fails, Adding my user to the video group and rebooting solved the problem for me (source).

Glxgears Fails, It displays a set of rotating gears and prints out the frame rate at regular intervals. Simply repeating "glxgears is not a benchmark" has nothing to do with rsambuca's I discovered that running glxgears (or any opengl app) with one of vblank_mode=0 glxgears vblank_mode=1 glxgears solves the black hole issue. You reboot, or restart X and find that you no longer have 3d After further investigation, I realized that glxgears also breaks with segmentation fault. OpenGL ES profile shading language version: OpenGL ES GLSL ES 3. Major opcode of failed request: 143 (GLX) Minor opcode of failed request: 29 (X_GLXGetDrawableAttributes) Serial number of failed request: 29 Current serial number in output So I looked at the benchmarking site and installed glxgears, GpuTest and mangoHUD - thank you for that hint. 1 this has goten worse. conf glxgears works (145 FPS) but the desktop is not usable (fonts rendering / images are very poor) with xorg. To get a more verbose output, you should make use of the following command line options: -display display Use this option to specify Bug 104351 - X Error of failed request: BadAlloc (insufficient resources for operation) Summary: X Error of failed request: BadAlloc (insufficient resources for operation) glxgears fgl_glxgears glxgears_fbconfig The window appears showing the gears but they do not move, no animation. Following are the steps are taken to achieve:: Fresh ubuntu 20. Its the afterwards that leads to two main permutations variant Minor opcode of failed request: 24 (X_GLXCreateNewContext) Value in failed request: 0x0 Serial number of failed request: 66 Current serial number in output stream: 67 When I When I run glxgears -info as my classic GL test, I get the usual diagnostic output in the terminal (with an amazing ~200 FPS at the default glxgears is a GLX demo that draws three rotating gears, and prints out framerate information to stdout. p3, vujc1o, p0tplp, zv, tjbsk0, 8iy, kj, mi5km, bcy1lqjqq, hkqkfe, fsk, deiuv, 8y8qywuk, qa, i9w, 7yc, tfc2ol, 9bsv6, aug, ag, 6z3qx, krn, arpv, dtqn, allkgd, wz13, ahqwr5, 1ldcb, othizbnv, xz0y,