No visible mouse pointer for USB-passthrough

prince_ruperts_qube · April 13, 2024, 4:15pm

Due to the “no mouse grabbing possible in VM”, I connected a second mouse and moved that from sys-usb to a normal qube. The mouse is working fine there, but there is no mouse pointer rendered for it, so it’s working, but unusable.

I tried it on different VMs, based on different templates, always with the same result. When starting a live-CD in a new and empty HVM (with qvm-features that_vm stubdom-qrexec 1 before boot), forwarding works and the pointer is there.

I am at 80% to an usable setup with Qubes OS, which is awesome, considering, that I’m lurking since version 2.x, but it’s always the details…

Partially similar topic, but no solution: Mouse Problems in Games

Any pointers would be greatly appreciated!

prince_ruperts_qube · April 14, 2024, 2:58pm

I did some digging and hit the following:

github.com

QubesOS/qubes-gui-agent-linux/blob/292277868c8ed6f8c33182df1a5050c32a38ded3/xf86-video-dummy/src/dummy_cursor.c#L58


      
          static void
          dummySetCursorColors(ScrnInfoPtr pScrn, int bg, int fg)
          {
              DUMMYPtr dPtr = DUMMYPTR(pScrn);
              
              dPtr->cursorFG = fg;
              dPtr->cursorBG = bg;
          }
          
          static void
          dummyLoadCursorImage(ScrnInfoPtr pScrn, unsigned char *src)
          {
          }
          
          static Bool
          dummyUseHWCursor(ScreenPtr pScr, CursorPtr pCurs)
          {
              DUMMYPtr dPtr = DUMMYPTR(xf86ScreenToScrn(pScr));
              return(!dPtr->swCursor);
          }

github.com

QubesOS/qubes-gui-agent-linux/blob/292277868c8ed6f8c33182df1a5050c32a38ded3/xf86-video-dummy/src/dummy_driver.c#L240


      
              .prepare = dummy_crtc_stub,
              .mode_set = dummy_crtc_mode_set,
              .commit = dummy_crtc_stub,
              .gamma_set = dummy_crtc_gamma_set,
              .shadow_allocate = dummy_crtc_shadow_allocate,
              .shadow_create = NULL, /* These two should not be invoked if allocate
                                        returns NULL. */
              .shadow_destroy = NULL,
              .set_cursor_colors = NULL,
              .set_cursor_position = NULL,
              .show_cursor = NULL,
              .hide_cursor = NULL,
              .load_cursor_argb = NULL,
              .destroy = dummy_crtc_stub
          };
          
          static void
          dummy_output_stub (xf86OutputPtr output)
          {
          }

Could those positions be related to the problem?