This is useful to see that pixmaps, tiles, etc have been properly cached. XFree86 releases later than 4. If this option is removed form xorg. However this version of the Chips and Technologies driver has many new features and bug fixes that might make users prefer to use this version. For some machines the LCD panel size is incorrectly probed from the registers. This option might be used if the default video overlay key causes problems. The whole thing is divided by the bytes per pixel, plus an extra byte if you are using a DSTN.

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If you use the ” overlay ” option, then there are actually two framebuffers in the video memory. Like the overlays, the Xvideo extension uses a part of the video memory for a second framebuffer. If this option is removed form xorg. Note that many chips are capable of technologied memory clocks than actually set by BIOS.

Many potential programmable clock register setting are unstable. However, some machines appear to have this feature incorrectly setup. As an additional note, the boot splash has a bit of text referring to the video chipset that might tell us a little more: The xx chipsets can use MMIO for all communications with the video processor. For LCD screens, the lowest clock that gives acceptable contrast and flicker is usually the best one.

Linear addressing is not supported for this card in the driver. For CRT’s you can also try to tweak the mode timings; try increasing the second horizontal value somewhat. If you are driving the video memory too fast too high a MemClk you’ll get pixel corruption as the data actually written to the video memory is corrupted by driving the memory too fast.

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As use of the HiQV chipsets multimedia engine was supposed to be for things like zoomed video overlays, its use was supposed to be occasional and so most machines have their memory clock set to a value that is too high for use with the ” Overlay ” option. It is possible to turn the linear addressing off with this option. With the release of XFree86 version 4. In fact the timing for the flat panel are dependent on the specification of the panel itself and are independent of the particular mode chosen.

If the user has used the ” UseModeline ” or ” FixPanelSize ” options the panel timings are derived from the mode, which can be different than the panel size. Note that it is overridden by the ” SWcursor ” option.

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This chip is similar to thevhips it also includes XRAM support and supports the higher dot clocks of the This option sets the centering and stretching to the BIOS default values. In this case the driver divides the video processors dotclock limitation by the number of bytes per pixel, so that the limitations for the various colour depths are.

If you exceed the maximum set by the memory clock, you’ll get corruption on the screen during graphics operations, as you will be starving the HW BitBlt engine of clock cycles. For LCD modes, it is possible that your LCD panel requires different panel timings at the text console than with a graphics mode.

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For x chipsets the server assumes that the TFT bus width is 24bits. If the screen is using a mode that BIOS doesn’t know about, then there is no guarantee that it will be resumed correctly. The Xorg X server, allows the user to do damage to their hardware with software with old monitors which may not tolerate bad display anc.

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As mentioned before, try disabling this option. There are therefore a wide variety of possible forms for all options. Hence you will see a line like. With this option all of the graphics are rendered into a copy of the framebuffer that is keep in the main memory of the computer, and the screen is updated from this copy. However there is no reliable way of probing the memory clock used in these chipsets, and so a conservative limit must be taken for the dotclock limit.

When constructing a modeline for use with the Chips and Technologies driver you’ll needed to considered several points. Dual refresh rate display can be selected with the ” DualRefresh ” option described above.

For the HiQV series of chips, the memory clock can be successfully probed. The server will then allow the mode to occupy the whole x LCD.